This is the 13462nd most frequent Russian word.
нападении
"Attack" or "assault."
The word 'нападении' in this sentence is used as a noun in the prepositional case, referring to the act of attacking or an assault.
В новостях рассказали о нападении на банк вчера вечером.
The news reported an attack on a bank last night.
Here, 'нападения' is a noun in the genitive case, indicating the action from which one might be defending themselves.
На учёбе обсуждали тему самозащиты в случае нападения.
At school, they discussed the topic of self-defense in case of an attack.
In this example, 'нападении' is again in the prepositional case, used as part of describing the circumstance or topic related to an attack.